Sewing-machine feed and loop-taker actuating mechanism.



No. 809,566. PATENTBD JAN. 9, 1906.

M. HEMLEB.

SEWING MACHINE FEED AND LOOP TAKER ACTUATING MECHANISM.

APPLICATION FILED JUNE 12, 1905.

%Wmeooao 1'0 all whom it may concern.-

UNITED STATES PATENT OFFICE.

MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Jan. 9, .1906.

Application filed June 12, 1905. Serial No. 264.769.

Be it known that I, MARTIN HEMLEB, a

' citizen of the United States, residing at Elizabeth, in the county ofUnion and State of New Jersey, have invented certain new and usefulImprovements in Sewing-Machine Feed and Loop-Taker Actuating Mechanism,of which the following is a specification, reference being had thereintothe accompanying drawin s..

This lnvention relates to an improvement in that class ofsewing-machines comprising a hollow bracket-arm having journaled thereinthe main shaft, from which is derived by separate connections theoperative reciprocatory movements of the lower feeding mechanism and themore rapid rotary movements of the loop-taker shaft, the latter beingeffected through a non-metallic belt; and the inventionhas forits objectto provide means whereby the metallic connections between the main shaftand the feeding mechanism beneath may be kept thoroughly oiled withoutinjury to the non-metallic-belt connection between the main shaft andloop-taker shaft by oil thrown from such positive connections in V theoperation of the machine and it has for its further object to providemeanswhereby the non-metallic belt may be readily accessible for renewalwithout disturbing the main shaft in its bearings, as has heretoforebeennecessary.

I The invention consists, essentially, in a main shaft journaled in thebracket-arm and provided within the latter with positive con nectionswith feeding mechanism disposed beneath the bed-plate and havingexterior to. said bracket-arm a pulley or sprocketwheel connected with'a similar wheel upon the loop-taker shaft by means of a non-metallicbelt.

It also consists in a removable housing inclosing the connection betweenthe main and loop-taker shafts.

The invention will be understood by reference to the drawings annexed,in which Figure 1 is a side elevation of a sewingmachine of the Singerrevolving-hook type with the rear portion partly in section to exposethe construction and arrangement of the main shaft connections with thelooptaking and feeding devices; and Fig. 2 is a rear end elevation ofthe same with the balance-wheel and rear end of the belt and pulleyhousing removed.

The frame of the machine is constructed with the usual bed-plate 1 andthe overhanging bracket-arm 2, in which is journaled the main shaft 3,provided with the feed-actuating and feed-lifting eccentrics '4 and 5,embraced, respectively, by the straps 6 and 7 of the connecting-rods 8and 9, pivotally connected with suitable crank-arms 1'0 and 11 upon thefeed-actuating and feed-lifting rockshafts 12 and 13, respectively,mounted beneath the bed-plate 1. The columnar portion of the bracket-armdirectly above the eccentrics 4 and 5 is provided with a removable cap14 for access to such parts, the connecting-rod straps being providedwith the usual perforated bosses 15, by which they are provided withoil. The machine is provided with the usual reciprocating needle-bar 16,

deriving its reciprocating movements from the main shaft and carryingthe needle 17, cooperating with a loop-taker 18, mounted upon a rotaryloop-taker shaft 19, journaled in suitable bearings beneath thebed-plate and having at its rearward end the sprocket wheel 20,connected by the perforated nonmetallic belt 21, preferably of rawhide,with a sprocket-wheel 22, of larger diameter, fixed upon the rear endportion of the main shaft 3 outside of the bracket-arm 2.

As represented in the drawings, the sprocket-wheels 20 and 22 are formedof cylindrical pulleys provided with spaced radial pins 23, adapted toenter the holes 24 in the connecting-belt, the latter being twice thediameter of the former to impart to the loop-taker shaft two rotationsto each one of the main shaft, and each of said pulleys is provided witha hub and set-screw 25, by which it is secured upon its respectiveshaft.

A housing 26 of rectangular cross-section is applied to the rear end ofthe bracket-arm to inclose the sprocket-wheels 20 and 22 and theconnecting-belt 21, perforated studs 27 being provided in said housingthrough which are extended the fastening-screws 2S, entering threadedapertures in the bracketarm for securing the housing firmly in positionthereon.

ICO

From the nature of the perforated belt connecting the pulleys and 22 itis'evident that the spattering of oil thereon from the metallicconnections of the upper and lower shafts is highly objectionable inaffecting the length of such belt, as well as its durability. By thepresent improvement the columnar portion of the bracket-arm is formed inpracimportant advantage in the accessibility of less band for such use.

the belt 21 for renewal. In sewing-machines heretofore provided wth suchdriving means for the lower rotary shaft the inclosure of the belt andsp1'ocketwheels within the hollow upright portion of the bracket-arm hasnecessitated the withdrawal of the main shaft from its bearings and theconsequent disengagement of its connections with other parts of themachine to permit of such operation, the belt being necessarily in theform of an end- By the present improvement the renewal of the belt 21requires merely the removal of the balancewheel 29 by the loosening ofits set-screw 30 and the subsequent detachment of the housing 26 bywithdrawal of its fastening-screws 28, when the old belt may be readilyslipped off the pulleys over the short pins 23 and a new one applied,when the machine will be again placed in readiness for operation by thereapplication of the housing 26 and balance-wheel 29.

It will thus be seen that the application of the pulleys andconnecting-belt to the .respective shafts involves two importantfunctions in not onlyinsuring the belt from becoming moistened with oilfrom the metallic connections, but in affordin easy access for rethemain shaft with parts of the mechanism actuated thereby.

Having thus set forth the nature of the invention, what I claim hereinis 1. In a sewing-machine, the combination with the frame comprising abed-plate and a hollow bracket-arm, and a rotary main shaft journaled inthe bracket-arm, of stitch-forming mechanism comprising a loop-taker anda rotary shaft mounted beneath the bedplate for imparting a rotatingmotion to said loop-taker, feeding mechanism disposed beneath thebed-plate, metallic connections disposed within and inclosed by saidbracketarm intermediate the main shaft and feeding mechanism,pulley-wheels mounted upon the main and looper shafts external to saidbracket-arm, a non-metallic belt connecting said pulley-wheels, ahousing inclosing said pulley-wheels and connecting-belt, and means forremovably securing said housing to said bracketarm.

2. In a sewing-machine, the combination with the frame comprising abed-plate and a hollow bracket-arm formed with two closed verticalcompartments one removable from the other and means for securing thesame together, and a rotary main shaft journaled in said bracket-arm andextending through the upper portion of both of said compartments, of aplurality of lower shafts mounted beneath the bed-plate, pulle vwheelsapplied to said main shaft and one of the lower shafts within theremovable compartment of said bracket-arm and a non-metallic belt connecting said pulleys, and metallic connections within the othercompartment of said bracketarm intermediate said main shaft and othersof the lower shafts.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses MARTIN HEMLEB.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN.

